Pre-Requisite

Connect to Raspberry Pi

Find IP of available Pi
Go to 192.168.1.1 in your browser with username admin and password password to check IP of all connected Raspberry Pis. Under connected devices tab, you will be able to see the IP of all connected Raspberry Pis.

Connect through SSH 

ssh pi@<ip>

Use password raspberry for connection or for sudo command.

Python Setup

Python Environment
We are using Python 2.7 for this project. PLEASE DO NOT CHANGE THE RASPBERRY PI's DEFAULT PYTHON SETTING.

Package Installation
pip is always recommended for Python package installations. A cleaner way would be using virtualenv, so that your environment won't interfere with others'.

Long compling time with pip installation

You can use piwheels by placing the following lines in /etc/pip.conf:

[global]
extra-index-url=https://www.piwheels.org/simple

Then pip will search in wheels to install any package first.

Also, you can download your wheel from here manually: https://pythonwheels.com/

OS Install

We use HyPriot OS, a lightwieght Ubuntu-based, for our PIs, unless said otherwise. It does not have a GUI, but it will always derive the HDMI output (even if you did not connect it during boot).

For making an SD card, you can use their flash tool. Below is an example:

flash -u cloud-config.yml https://github.com/hypriot/image-builder-rpi/releases/download/v1.11.0/hypriotos-rpi-v1.11.0.img.zip

and the content for cloud-config.yml to automatically configure user, password, and WiFi connection:

#cloud-config
# vim: syntax=yaml
#

# The current version of cloud-init in the Hypriot rpi-64 is 0.7.9
# When dealing with cloud-init, it is SUPER important to know the version
# I have wasted many hours creating servers to find out the module I was trying to use wasn't in the cloud-init version I had
# Documentation: http://cloudinit.readthedocs.io/en/0.7.9/index.html

# Set your hostname here, the manage_etc_hosts will update the hosts file entries as well
hostname: pi
manage_etc_hosts: true

# You could modify this for your own user information
users:
  - name: pi
    gecos: "Hypriot Pirate"
    sudo: ALL=(ALL) NOPASSWD:ALL
    shell: /bin/bash
    groups: users,docker,video
    plain_text_passwd: raspberry
    lock_passwd: false
    ssh_pwauth: true
    chpasswd: { expire: false }

# # Set the locale of the system
# locale: "en_US.UTF-8"

# # Set the timezone
# # Value of 'timezone' must exist in /usr/share/zoneinfo
# timezone: "America/Los_Angeles"

# # Update apt packages on first boot
# package_update: true
# package_upgrade: true
# package_reboot_if_required: true
package_upgrade: false

# # Install any additional apt packages you need here
# packages:
#  - ntp

# # WiFi connect to HotSpot
# To make wifi work with RPi3 and RPi0
# you also have to set "enable_uart=0" in config.txt
# See no-uart-config.txt for an example.
#
# # - use `wpa_passphrase SSID PASSWORD` to encrypt the psk
write_files:
  - content: |
      allow-hotplug wlan0
      iface wlan0 inet dhcp
      wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
      iface default inet dhcp
    path: /etc/network/interfaces.d/wlan0
  - content: |
      country=US
      ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
      update_config=1
      network={
      ssid="NETGEAR79"
      psk="78zBJr!4bVdpaFIQ"
      proto=RSN
      key_mgmt=WPA-PSK
      pairwise=CCMP
      auth_alg=OPEN
      }
    path: /etc/wpa_supplicant/wpa_supplicant.conf

# These commands will be ran once on first boot only
runcmd:
  # Pickup the hostname changes
  - 'systemctl restart avahi-daemon'

  # Activate WiFi interface
  - 'ifup wlan0'

Connect to Wifi with Terminal

edit the file /etc/wpa_supplicant/wpa_supplicant.conf with sudo nano /etc/wpa_supplicant/wpa_supplicant.conf. Copy below info:

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=US

network={
        ssid="NETGEAR79"
        psk="78zBJr!4bVdpaFIQ"
        proto=RSN
        key_mgmt=WPA-PSK
        pairwise=CCMP
        auth_alg=OPEN
}

Exit with ctrl^x, Enter.